FormsCentral is still spinning when selecting check for updates - have screen grabbed version as per below:

No updates were showing in the CC application manager for Acrobat - have just launched it to get the version number and clicked check for updates and there are some for it! peculiar that it doesnt show in the app updates section - will add to post if this fixes it.

Unfortunately updating Acrobat hasn't fixed sign in or update of FormsCentral. Current Acrobat version can be seen below:

I'm on a mac with no proxy, have tried both at work and on my home network with the same result:

Another thing I noticed while trying to get it to work is that the save button under preferences (was trying to initiate auto update) is greyed out meaning you can only press cancel - I assumed it's because there is no user logged in?

Note that this will delete any local files you have created so far. There is a way to clear the local storage without losing any of your form. I'll update this post with the correct command line when I get to work.

The fast that the Update section is greyed out in the dialog is good information for me to investigate further.